Reading Sheeple talks are always fun.
It's about choice. Even on android, there are many horrible popups that android warns the user before installing any app outside Play Store. (The Epic lawsuit also complained about this) If the user wants to do then give them the choice. Giving Choice is the problematic part.
The security thing is just a joke. The walled garden isn't safe (https://www.theverge.com/2021/4/21/22385859/apple-app-store-...)